Eaton Weatherhead C5129X4 Carbon Steel SAE 37-Degree JIC Flare-Twin Fitting, Cap, 1/4" Tube OD (Pack of 10) Cap for closing the end of a tube fitting Terminates 1/4" tube OD JIC 37-degree flare male fitting Zinc-plated carbon steel for durability and resistance to rupture under high pressure 5,000 PSI maximum working pressure Meets SAE J514 standards for quality assurance